#ifndef __COMM_HPP__
#define __COMM_HPP__ 


#include<iostream>
#include<cerrno>
#include<cstdio>
#include<string>
#include<cstring>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<sys/types.h>
#include<assert.h>
#include<unistd.h>

using namespace std;

#define PATHNAME "."
#define PROJID 0x6666

const int gsize= 4096;

key_t GetKey()
{
    key_t k=ftok(PATHNAME,PROJID);
    if(k==-1)
    {
        cerr<<errno<<":"<<strerror(errno)<<endl;
        exit(1);
    }
    return k;
}

string toHex(int x)
{
    char buffer[64];
    snprintf(buffer,sizeof buffer,"0x%x",x);
    return buffer;
}

static int createShmHelper(key_t k, int size, int flag)
{
    int shmid = shmget(k, gsize, flag);
    if(shmid == -1)
    {
        cerr << "error: " << errno << " : " << strerror(errno) << endl;
        exit(2);
    }
    return shmid;
}

int creatShm(key_t k,int size)
{
    return createShmHelper(k, size, IPC_CREAT | IPC_EXCL | 0666);
}

int getShm(key_t k,int size)
{
    return createShmHelper(k, size, IPC_CREAT);
}
void delshm(int shmid)
{
    int n=shmctl(shmid,IPC_RMID,nullptr);
    assert(n!=-1);
    (void)n;
}
#endif